foo.cc: In function 'int main()':
foo.cc:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i=0;i<=wod.size()-1;i++){
             ~^~~~~~~~~~~~~~
foo.cc:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int j=0;j<=wod.size()-1;j++)
             ~^~~~~~~~~~~~~~

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